Automatic Lighting Control Unit Input Test/Replacement

NOTE: Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

1. Turn the ignition switch to LOCK (0).

2. Disconnect the 14P connector (A) from the automatic lighting control unit (B).

3. Inspect the connector and socket terminals to be sure they all making good contact.

- If the terminals are bent, loose, or corroded, repair them as necessary, and recheck the system.
- If the terminals are OK, go to step 4.

4. With the connector still disconnected, do the following input tests.

- If any tests indicate a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to step 5.

5. Reconnect the connectors, then do the following input tests.

- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, replace the automatic lighting control unit.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Lamp Control Module: Service and Repair

Use the Manual With the Right Hardware

When to See a Mechanic

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